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Method of Reasoning-SN. The correct answer choice is (B)
The argument concludes that since calls are the only means of the bats locating each other, and the pups cannot distinguish between various adult calls, the bat mothers must be able to distinguish their pup's calls.
The argument proceeds by explaining what the options are, and then eliminating all but one. You should focus on that when describing what the argument seeks to do.
Answer choice (A) Since the argument does not involve comparison between a sample and a population, it is unlikely that the argument generalizes from a small group, and this choice is wrong. Furthermore, this choice can be seen as somewhat contradictory, as pups seem different from the mothers.
Answer choice (B): This is the correct answer choice. The argument attempts to arrive at a final explanation by eliminating options.
Answer choice (C) Since the argument does not describe the mechanism by which mothers use calls to locate their pups, this choice is wrong.
Answer choice (D) Since the argument implies that the pups and mothers may be different in their ability to distinguish calls, it does not follow that argument makes conclusions based on similarities.
Answer choice (E) The argument attempts to resolve the general rule concerning how pups and mothers reunite, not to apply that rule.